Cylinder lock



Apri-l 25; 1939 H. MACHINIST I 2,155,726

CYLINDER LOCK Filed May 2, 1958 Patented Apr. 25, 1939 UNITED staresk PATEN ortie Dudley Lock Corporation,

poration of Illinois Chicago, Ill., a, cor- Application May 2, 1938, Serial No. 205,426 4 Claims.' (Cl. yY0-4380) This invention relates to cylinder locks, and its primary object is to provide a bolt-actuating arm for such a lock with means to Veffectively lengthen.

the arm in its active position. Another object is to provide means for keeping the arm Wholly within the outlines of the lock casing when the arm stands at inactive position so that the lock may be readily installed through an opening into which the casing itself fits snugly. The invention consists in certain features and elements of construction as herein shown and described and as indicated by the claims.

In the drawing:

Figure l is a sectional view of a closure, suchA as a door, and a portion of a bolt housing,` together with a cylinder lock installed in a position of use, the key for the lock and a fragment Yof the bolt which it actuates being shown in dotted out,- line. f Figure 2 is an inner or rear end elevationcf the lock and its bolt-actuating arm, together with a fragment of the bolt with which it is designed to cooperate, the arm being shown at inactive position.

Figure 3 is a view similar to Figure 2, showing the arm in operative engagement with the bolt.

Figure 4 is a side elevation of the lock casing with the operating arm and its immediate connections shown in section to revealcertain cletails of the construction.

This invention is shown applied to a lock which includes a casing I, shown as cylindrical and externally threaded at 2 for securement in. the wall 3 of the metallic housing which houses the bolt d and other elements ofthe lock mechanism. The casing I encloses the usual rotatable cylinder or plug, together with the several tumblers and their springs which hold the cylinder against rotation normally, and which are shifted for releasing the cylinder when the proper key is inserted in the position indicated in dotted lines at 5 in Figure l. The key enters a key slot in the rotatable cylinder, so that after shifting the tumblers to release position the key itself serves for rotating the cylinder and swinging the arm 6 through the proper arc for shifting the bolt 4. It will be further understood that the housing, of Which one wall is shown at 3, is. set in a suitable mortice or recess in the body of the door 1, with an escutcheon plate 8 secured to the face of the door and arranged to steady the outer end of the cylindrical casing I of the 4cylinder lock.

The rotatable cylinder or plug, of which a portion is seen at 9 in Figure 4, is formed at its inner end With a non-circular part I which projects beyond the inner end II of the casing I. This non-circular portion IB may be simply a rounded projection with two sides flattened so as to fit intothe slot I2 extending longitudinally in the 5 arm 6. The extreme terminal portion I3 of the cylinder projects from the part I2, and may have a head I4 swedged over to retain a washer I5 which, in turn, overlaps the portion of the arm 6 which engages the flat-sided projection Ill, thus 1o securing the arm E permanently to the end of the cylinder 9.

Preferably, in its normal position, the arm 6 is dimensioned to lie within the cylindrical outline of the casing I, so that when the permutation l mechanism is installed in the wall 3 of the housing it may be entered directly in the threaded aperture of the wall 3 without any special manipulation. Normally, to provide proper space for the 1lockingtumblers which cooperate with the 20 rotatable plug or cylinder 9 in the casing I, in a well understood manner, the cylinder 9 is eccentrically mounted in the casing l; hence, when the. arm 6 is rotated through 180 degrees from its position Within the cylindrical outline, as shown in Figure 2, it projects beyond that outline, as indicated in Figure 3.

The present construction serves to increase the effective length of the arm as measured from the center of its rotation, which is the axis of the plug 9. For this purpose the slot l2 in the arm 6 is made longer than the noncircular portion I 0 of the cylinder 9, and a pin I6 is set in the rear end of the casing l, projecting for contact with the peripheral outline of the arm 6 as it is rotated 35 when the cylinder 9 is turned by its key 5. Said peripheral outline of the arm 6 constitutes a cam surface including portions 20 and 2! which tend to force the arm in a direction to increase its effective length as it is rotated into engagement with the notch I1 of the bolt 4. In the return movement, after the portions 2| and 20 have traversed the pin I6, cam portion 22 acts to shift the arm in the opposite direction until, nally, a groove 23, formed in the surface of the arm 6 which faces the end wall II of the cylinder I, rides over the pin I6 to the position indicated in Figures l and 2. This engagement of the pin I6 with the groove 23 tends to retain the arm at withdrawn position and thus facilitates the placement or removal of the lock unit from the housing wall 3. Preferably, a spring I8 is pocketed in the arm between the end of the slot I2 and the non-circular projection I 0, thus tending to facilitate this engagement of the slot 23 55 with the pin I6, as the arm swings back to normal position, and also serving to control the remainder of the movement of the arm in response to the engagement of its cam surfaces 20 and 2l with the pin IB. The pressure of the spring i8 will operate to maintain close contact between said pin and the cam surfaces of the arm, thus insuring smoothness of operation and avoiding any rattle or objectionable play between the parts.

It will be noted that, as shown in the drawing, the arm 6 is of symmetrical outline, so that its periphery provides additional cam surfaces 20P- and 22a which would cooperate with the pin I6 if the arm were rotated in the opposite direction to that which has been assumed in the foregoing description. Since locks and bolts are made for both right and left-hand operation, this provision is important and necessary to permit installation of the lock on either side of a door. It will be understood, of course, that in Figure 1 the portion of the door shown in section represents only a part of the total thickness of the door, and that the wall 3 of the lock housing is only one side of the structure; hence, a cylinder lock of the type described should be adapted for installation on either side of the door, which will result in right-handed operation for one side and left-handed operation for the other side.

While there is shown and described herein certain specic structure embodying the invention, it will be manifest to those skilled in the art that various modifications and re-arrangements of the parts may be made without departing from the spirit and scope of the invention, and that the same is not limited to the particular form herein shown and described, except in so far as indicated by the appended claims.

I claim:

1. In a cylinder lock including a casing, a lock cylinder journaled therein and a bolt-actuating arm carried by the end of the cylinder, said arm being adjustably engaged with the cylinder for movement transversely of the axis of cylinder rotation, together with a fixed abutment on the cylinder engageable with the peripheral portion of the arm when the cylinder is rotated, said peripheral portion being formed` as a cam for causing the arm to be projected farther from said axis of cylinder rotation as it approaches engagement with the bolt which it is to actuate.

2. In a cylinder lock including a casing, a lock cylinder journaled therein and a bolt-actuating arm carried by the inner end of the cylinder, said arm being slotted and engaged with the cylinder for sliding movement transversely of the axis of cylinder rotation, together with cam means on the arm and on the casing controlling such movement to cause the arm to be projected in the direction of its length as the cylinder is rotated, and a spring pocketed in one end of the slot of the arm for holding it yieldingly against projection in a position in which it does not project beyond the outline of the casing, said spring being adapted to be overcome by said controlling cam means as the arm is swung by rotation of the cylinder into bolt-engaging poi sition.

3. In a cylinder lock including a cylindrical casing, a lock cylinder eccentrically journaled therein and a bolt-actuating arm carried by the inner end of the cylinder, said arm being slidably engaged with the cylinder for movement transversely of the axis of cylinder rotation, together with a pin fixed on the inner end of the cylindrical casing and projecting therefrom for engaging the peripheral outline of said arm when the cylinder is rotated, said arm constituting a cam serving to control and cause sliding movement of the arm relative to the cylinder as the latter is rotated, whereby the arm is projected beyond the outline of the casing for engagement with the bolt and is withdrawn within said outline during another portion of the rotation of the cylinder, said arm having a transverse slot in its face opposite the end of the casing, said slot forming a continuation of the peripheral cam outline and engaging the arm when it is withdrawn within said casing outline.

4. In a cylinder lock including a casing, a lock cylinder eccentrically journaled therein and a bolt-actuating arm carried by the inner end of the cylinder, said arm being slidably engaged with the cylinder for movement transversely of the axis of cylinder rotation, together with cam means on the arm and casing controlling such movement to cause the arm to be projected beyond the outline of the casing for engagement with the bolt as the cylinder is rotated, and spring means associated with the arm holding it yieldingly in its position within the casing outline but adapted to be overcome by said controlling cam means as the arm is swung by rotation of the cylinder into bolt-engaging position.

HAROLD MACHINIST. 

